Drive Belt Routing GMC Cab & Chassis R3500

DESCRIPTION

The single ("serpentine" or "V" ribbed) drive belt system has been adopted by manufacturer's as a replacement for multiple "V" belt systems previously offered. The "serpentine" belt requires a belt tensioner similar to those used to control timing belt tension.

Use of a tensioner allows engine accessories to be mounted rigidly on the engine. The single belt drive system has a predicted life of 100,000 miles before replacement is required.

The belt tensioner has a wide functional range and is capable of maintaining tension during the expected life of the belt. Tensioner cannot compensate for extreme belt lengths. Poor tension control and possible tensioner damage can result from excessive belt length.

INSPECTION

Inspect belt for fraying. If fraying has occurred, ensure belt and tensioner are properly aligned. If tensioner has reached its limit of travel, belt is excessively stretched and replacement of belt is required.

If excessive noise is noticed from tensioner or idler, check for possible bearing failure. Small cracks in the back of the belt are acceptable. Do not apply "Belt Dressing" or any other additive to serpentine belt.

SERPENTINE BELT ROUTING

Install belt on crankshaft and belt-driven components as shown. All models have a self-tensioner and no adjustment is required. (Scheme 1)- (Scheme 5).

Note. Call out identifications are described at the bottom of each figure.

Scheme 1

Scheme 2

1. Belt.
2. Idler Pulley.
3. Air Conditioning Compressor.
4. Water Pump.
5. Crankshaft.
6. Tensioner.
7. Alternator.
8. Power Steering Pump.
9. AIR Pump.

Scheme 3

1. Belt.
2. Air Conditioning Compressor.
3. Tensioner.
4. Alternator.
5. Power Steering Pump.
6. Crankshaft.
7. Water Pump.
8. AIR Pump.
9. Idler Pulley.

Scheme 4

Scheme 5

1. Belt.
2. Air Conditioning Compressor.
3. Tensioner.
4. Alternator.
5. Power Steering Pump.
6. Crankshaft.
7. Water Pump.
8. Air Pump.
9. Idler Pulley.
10. Vacuum Pump (Diesel Engine Only).